{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2017:U7UIQVISQPUEXFRLF43SRRVMI5","short_pith_number":"pith:U7UIQVIS","canonical_record":{"source":{"id":"1706.04443","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-lat","submitted_at":"2017-06-14T12:32:29Z","cross_cats_sorted":[],"title_canon_sha256":"2631fdde4c6fd922c9d9851f7962c7cbec099c821f4d3d227e26e7730a717656","abstract_canon_sha256":"f9ba50cf30ff74a2026d62dba3db3753ace20b85966c920f36ad9d0a241ae6f4"},"schema_version":"1.0"},"canonical_sha256":"a7e888551283e84b962b2f3728c6ac47777ac61602fef2dea236f0240b6e6baa","source":{"kind":"arxiv","id":"1706.04443","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1706.04443","created_at":"2026-05-18T00:34:37Z"},{"alias_kind":"arxiv_version","alias_value":"1706.04443v2","created_at":"2026-05-18T00:34:37Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1706.04443","created_at":"2026-05-18T00:34:37Z"},{"alias_kind":"pith_short_12","alias_value":"U7UIQVISQPUE","created_at":"2026-05-18T12:31:46Z"},{"alias_kind":"pith_short_16","alias_value":"U7UIQVISQPUEXFRL","created_at":"2026-05-18T12:31:46Z"},{"alias_kind":"pith_short_8","alias_value":"U7UIQVIS","created_at":"2026-05-18T12:31:46Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2017:U7UIQVISQPUEXFRLF43SRRVMI5","target":"record","payload":{"canonical_record":{"source":{"id":"1706.04443","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-lat","submitted_at":"2017-06-14T12:32:29Z","cross_cats_sorted":[],"title_canon_sha256":"2631fdde4c6fd922c9d9851f7962c7cbec099c821f4d3d227e26e7730a717656","abstract_canon_sha256":"f9ba50cf30ff74a2026d62dba3db3753ace20b85966c920f36ad9d0a241ae6f4"},"schema_version":"1.0"},"canonical_sha256":"a7e888551283e84b962b2f3728c6ac47777ac61602fef2dea236f0240b6e6baa","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:34:37.080930Z","signature_b64":"mRyYimcAP7/51lD5nuBpuRKIfP3b1LcIcrJPZJeNACcLpLH3UADZG6uLoQJRjEkEUy1oq5P/ISTY768KW2tjBw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"a7e888551283e84b962b2f3728c6ac47777ac61602fef2dea236f0240b6e6baa","last_reissued_at":"2026-05-18T00:34:37.080394Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:34:37.080394Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1706.04443","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T00:34:37Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"n245iukTmwa5mun7ezmQAJPBcjM2NIo0QknTutTnB7zXQr1GaF705TkScQDO1/gG8xIr7wFvoA/Ykv4W/2YeCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-10T00:35:19.295000Z"},"content_sha256":"452a672634fb955c12527e9008d02d3d1c70bbeaa17fb85f6a3e6f549cb96634","schema_version":"1.0","event_id":"sha256:452a672634fb955c12527e9008d02d3d1c70bbeaa17fb85f6a3e6f549cb96634"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2017:U7UIQVISQPUEXFRLF43SRRVMI5","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Fighting topological freezing in the two-dimensional CP$^{N-1}$ model","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"hep-lat","authors_text":"Martin Hasenbusch","submitted_at":"2017-06-14T12:32:29Z","abstract_excerpt":"We perform Monte Carlo simulations of the CP$^{N-1}$ model on the square lattice for $N=10$, $21$, and $41$. Our focus is on the severe slowing down related to instantons. To fight this problem we employ open boundary conditions as proposed by L\\\"uscher and Schaefer for lattice QCD. Furthermore we test the efficiency of parallel tempering in a line defect. Our results for open boundary conditions are consistent with the expectation that topological freezing is avoided, while autocorrelation times are still large. The results obtained with parallel tempering are encouraging."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1706.04443","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T00:34:37Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"gwoauyG67Z2fk98lbPvLaJFNB3mJE9YwN/YaohCmtXBtsBNJS1uj3oXE/LOLmmZ48waG1f9mO1P9c50QGs3YDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-10T00:35:19.295725Z"},"content_sha256":"0244ee2fa3b4314f01a4126cb497bcdeb3c47614d149577cb52b469600943990","schema_version":"1.0","event_id":"sha256:0244ee2fa3b4314f01a4126cb497bcdeb3c47614d149577cb52b469600943990"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/U7UIQVISQPUEXFRLF43SRRVMI5/bundle.json","state_url":"https://pith.science/pith/U7UIQVISQPUEXFRLF43SRRVMI5/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/U7UIQVISQPUEXFRLF43SRRVMI5/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-06-10T00:35:19Z","links":{"resolver":"https://pith.science/pith/U7UIQVISQPUEXFRLF43SRRVMI5","bundle":"https://pith.science/pith/U7UIQVISQPUEXFRLF43SRRVMI5/bundle.json","state":"https://pith.science/pith/U7UIQVISQPUEXFRLF43SRRVMI5/state.json","well_known_bundle":"https://pith.science/.well-known/pith/U7UIQVISQPUEXFRLF43SRRVMI5/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:U7UIQVISQPUEXFRLF43SRRVMI5","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"f9ba50cf30ff74a2026d62dba3db3753ace20b85966c920f36ad9d0a241ae6f4","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-lat","submitted_at":"2017-06-14T12:32:29Z","title_canon_sha256":"2631fdde4c6fd922c9d9851f7962c7cbec099c821f4d3d227e26e7730a717656"},"schema_version":"1.0","source":{"id":"1706.04443","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1706.04443","created_at":"2026-05-18T00:34:37Z"},{"alias_kind":"arxiv_version","alias_value":"1706.04443v2","created_at":"2026-05-18T00:34:37Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1706.04443","created_at":"2026-05-18T00:34:37Z"},{"alias_kind":"pith_short_12","alias_value":"U7UIQVISQPUE","created_at":"2026-05-18T12:31:46Z"},{"alias_kind":"pith_short_16","alias_value":"U7UIQVISQPUEXFRL","created_at":"2026-05-18T12:31:46Z"},{"alias_kind":"pith_short_8","alias_value":"U7UIQVIS","created_at":"2026-05-18T12:31:46Z"}],"graph_snapshots":[{"event_id":"sha256:0244ee2fa3b4314f01a4126cb497bcdeb3c47614d149577cb52b469600943990","target":"graph","created_at":"2026-05-18T00:34:37Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"paper":{"abstract_excerpt":"We perform Monte Carlo simulations of the CP$^{N-1}$ model on the square lattice for $N=10$, $21$, and $41$. Our focus is on the severe slowing down related to instantons. To fight this problem we employ open boundary conditions as proposed by L\\\"uscher and Schaefer for lattice QCD. Furthermore we test the efficiency of parallel tempering in a line defect. Our results for open boundary conditions are consistent with the expectation that topological freezing is avoided, while autocorrelation times are still large. The results obtained with parallel tempering are encouraging.","authors_text":"Martin Hasenbusch","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-lat","submitted_at":"2017-06-14T12:32:29Z","title":"Fighting topological freezing in the two-dimensional CP$^{N-1}$ model"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1706.04443","kind":"arxiv","version":2},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:452a672634fb955c12527e9008d02d3d1c70bbeaa17fb85f6a3e6f549cb96634","target":"record","created_at":"2026-05-18T00:34:37Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"f9ba50cf30ff74a2026d62dba3db3753ace20b85966c920f36ad9d0a241ae6f4","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-lat","submitted_at":"2017-06-14T12:32:29Z","title_canon_sha256":"2631fdde4c6fd922c9d9851f7962c7cbec099c821f4d3d227e26e7730a717656"},"schema_version":"1.0","source":{"id":"1706.04443","kind":"arxiv","version":2}},"canonical_sha256":"a7e888551283e84b962b2f3728c6ac47777ac61602fef2dea236f0240b6e6baa","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a7e888551283e84b962b2f3728c6ac47777ac61602fef2dea236f0240b6e6baa","first_computed_at":"2026-05-18T00:34:37.080394Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:34:37.080394Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"mRyYimcAP7/51lD5nuBpuRKIfP3b1LcIcrJPZJeNACcLpLH3UADZG6uLoQJRjEkEUy1oq5P/ISTY768KW2tjBw==","signature_status":"signed_v1","signed_at":"2026-05-18T00:34:37.080930Z","signed_message":"canonical_sha256_bytes"},"source_id":"1706.04443","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:452a672634fb955c12527e9008d02d3d1c70bbeaa17fb85f6a3e6f549cb96634","sha256:0244ee2fa3b4314f01a4126cb497bcdeb3c47614d149577cb52b469600943990"],"state_sha256":"c3d62c592489888bf4ef15ce2bcb5ccfb368e08a1b5694f7df1f8feb0c494541"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"myu5TqdrjSAdCf3K8Y/YrXK/3qWk/CRw8i3pBlynPyIz+C19OgxQMaFiuMQp61sdWW+DWPMmrqNtNFyP0IH7CA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-10T00:35:19.299800Z","bundle_sha256":"77e104485ec66238c918ff8c516e4eccf33579a76c108ae1223ab3361657683a"}}